Alert archive / Oklahoma / Mesoscale Discussions in 2013
Mesoscale Discussion 913
The Storm Prediction Center issued this mesoscale discussion at May 31, 2013, 6:33 PM CDT for 9 counties in Oklahoma. It was in force for 27 min.
The area
The outline as issued.
The facts
- Issued
- May 31, 2013, 6:33 PM CDT (23:33 UTC)
- Expired
- May 31, 2013, 7:00 PM CDT
- In force
- 27 min
- Issued by
- the Storm Prediction Center
Counties Canadian County, OK, Cleveland County, OK, Kingfisher County, OK, Logan County, OK, Noble County, OK, Oklahoma County, OK, Osage County, OK, Pawnee County, OK, Payne County, OK
The radar
The Norman radar (KTLX), 106 km from the middle of the area, began a volume at 23:32 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Lamont, OK (KLMN), launched 12:00Z, 11.6 hours before the alert went out and 72 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 1951 J/kg
- Mixed-layer CIN
- -128 J/kg
- Mixed-layer LCL
- 775 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- 205 m²/s²
- 0-3 km storm-relative helicity
- 213 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.8
The text
As transmitted, in the capitals the NWS used until 2016.
864 ACUS11 KWNS 312334 SWOMCD SPC MCD 312333 KSZ000-OKZ000-010000- MESOSCALE DISCUSSION 0913 NWS STORM PREDICTION CENTER NORMAN OK 0633 PM CDT FRI MAY 31 2013 AREAS AFFECTED...CNTRL THROUGH NRN OK CONCERNING...TORNADO WATCH 262... VALID 312333Z - 010000Z THE SEVERE WEATHER THREAT FOR TORNADO WATCH 262 CONTINUES. SUMMARY...TORNADIC SUPERCELL MOVING TOWARD THE OKLAHOMA CITY METRO AREA. OTHER STORMS CONTINUE FROM NCNTRL THROUGH NERN OK AND REMAIN CAPABLE OF PRODUCING VERY LARGE HAIL AND STRONG TORNADOES. DISCUSSION...SUPERCELL WITH A HISTORY OF PRODUCING TORNADOES CURRENTLY LOCATED OVER CANADIAN COUNTY CONTINUES EWD AT AROUND 20 KT AND IS BEGINNING TO MOVE INTO THE OKLAHOMA CITY METRO AREA. THIS STORM IS ALONG THE SRN END OF A BROKEN LINE WHERE STORM RELATIVE INFLOW WILL REMAIN UNIMPEDED...SUGGESTING IT WILL CAPABLE OF PRODUCING STRONG TORNADOES AND VERY LARGE HAIL AS WELL AS DAMAGING WIND NEXT COUPLE HOURS. OTHER STORMS INCLUDING A FEW SUPERCELLS CONTINUE ALONG THE NE-SW ORIENTED COLD FRONT. THIS ACTIVITY WILL ALSO LIKELY PRODUCE VERY LARGE HAIL...STRONG TORNADOES AND DAMAGING WIND. ..DIAL.. 05/31/2013 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...TSA...ICT...OUN... LAT...LON 36849614 35949676 34949728 35749826 37039651 36849614
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 30, 8:09 PM CDT | Mesoscale Discussion | SPC | Adair, Sequoyah | 66 min |
| May 30, 8:46 PM CDT | Tornado Watch | SPC | Adair, Cherokee, Delaware, Haskell, LeFlore, Sequoyah | 7 hr |
| May 30, 9:03 PM CDT | Mesoscale Discussion | SPC | Carter, Coal, Garvin, Hughes, Johnston, McIntosh and 6 more | 57 min |
| May 30, 11:28 PM CDT | Mesoscale Discussion | SPC | Adair, LeFlore, Sequoyah | 2 hr |
| May 31, 1:57 AM CDT | Mesoscale Discussion | SPC | LeFlore | 93 min |
| May 31, 1:49 PM CDT | Mesoscale Discussion | SPC | Craig, Delaware, Nowata, Ottawa | 116 min |
| May 31, 2:40 PM CDT | Mesoscale Discussion | SPC | Blaine, Caddo, Canadian, Carter, Cleveland, Comanche and 29 more | 95 min |
| May 31, 3:27 PM CDT | Tornado Watch | SPC | Blaine, Caddo, Canadian, Carter, Cleveland, Comanche and 36 more | 9 hr |
| May 31, 4:58 PM CDT | Mesoscale Discussion | SPC | Caddo, Canadian, Carter, Cleveland, Coal, Comanche and 29 more | 92 min |
Nearby
Mesoscale Discussions in Oklahoma, 2013Every mesoscale discussion in 2013
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.